Format Guide May 8, 2026

Sherlock's Mystery Bounties is JackPoker's dedicated mystery-bounty tournament series, named around a detective theme where every player carries a "case file" — a sealed bounty envelope that reveals its value only when the player is eliminated. The format has become one of the fastest-growing tournament structures in online poker because it creates a secondary prize layer that is independent of the main prize pool, making every elimination a potentially significant financial event regardless of where you finish in the standings. This guide covers exactly how the format works, how KO prizes scale, the expected value math behind calling decisions, and when to deviate from standard ICM to chase a large bounty.

How Sherlock's Mystery Bounty Format Works

Every player who enters Sherlock's Mystery Bounties contributes to two separate pools. A portion of the buy-in — typically 30–40% — goes into the mystery bounty pool, while the remainder feeds the standard prize pool paid to the top finishers. Each player's bounty contribution is packaged into a sealed "case file" with an assigned but hidden value. When you eliminate a player, that case file is revealed and the bounty is credited to your account immediately as Instant Cash — before the tournament even finishes.

The critical mechanic is that bounties are randomly assigned from a pool of envelopes across a wide range of values. Some envelopes contain small bounties at or near the minimum. Others contain super bounties worth many times the buy-in. The distribution is calibrated so that the average bounty, across all envelopes, equals the per-player bounty contribution — but the variance is deliberately high to create excitement. A player who eliminates three opponents in the first hour might collect more bounty EV than they would from reaching the final table in a standard MTT.

KO Prize Scaling: Minimum to Super Bounty

In Sherlock's Mystery Bounties at the standard $55 buy-in, the bounty pool allocation is approximately $20 per player ($35 goes to the prize pool). Bounty envelopes are distributed across the following tiers:

• Minimum bounty ($5.50): The smallest envelope value. Appears most frequently — roughly 50% of all envelopes in the field.
• Standard bounty ($11–$22): The typical range. Approximately 35% of all envelopes. Worth calling for but not worth ICM-compromising plays to chase.
• High bounty ($55–$110): Present in roughly 12% of envelopes. A $110 bounty on a $55 buy-in is a 2× return from the KO alone, making aggressive calls against these players strongly positive EV.
• Super bounty ($275–$550): Rare — approximately 3% of envelopes. The $550 super bounty is a 10× return from one elimination. Calling any reasonable all-in from a player carrying a super bounty is correct regardless of chip EV.

The "Sherlock" theme adds one additional mechanic: a Detective Jackpot envelope is hidden in each flight. One player in every tournament carries a Jackpot envelope worth $500 to $2,000 depending on field size. You cannot identify who carries it — hence the detective theme — but eliminating any player carries the possibility of uncovering the jackpot.

Expected Value Math: When to Call

The fundamental EV calculation for a bounty call differs from a standard ICM call because you receive the bounty regardless of whether you finish in the money. In a standard tournament, calling an all-in that risks your tournament life when you are near the bubble has a strong ICM cost. In Sherlock's Mystery Bounties, you must add the expected bounty EV to your chip EV before making the decision.

The calculation framework: if you are considering calling an all-in with 40% equity, your chip EV from the call is (0.40 × opponent's stack) minus (0.60 × your stack). Add to this the bounty EV — which is your win probability (0.40) times the expected value of the opponent's bounty envelope. Since the average envelope is worth approximately $20 in a $55 event, the bounty contribution to EV is 0.40 × $20 = $8 per call. This bounty EV is paid in Instant Cash and has full monetary value, meaning it shifts the break-even equity threshold for calls downward by several percentage points.

At the final table, the bounty EV becomes relatively smaller compared to the prize-pool jumps, but it never becomes zero. The correct adjustment is to widen calling ranges by approximately 5–8% relative to standard ICM throughout the tournament, with the widening most aggressive in the early and mid-game where prize-pool jumps are minimal and bounties represent a larger share of total expected payout.

Cover Stack and the Bounty Gamble Decision

One of the most common strategic errors in mystery bounty formats is calling all-ins when you do not have the cover stack. If you call an all-in and win, you collect the opponent's bounty. If you call and lose, you are eliminated and your own bounty is collected by the opponent. When you are the shorter stack calling, your bounty is at risk in addition to your chips — this makes the call require higher equity than when you cover the opponent.

The rule of thumb: only gamble your bounty against a player whose envelope has higher expected value than your own. Since you cannot observe envelope values before the call, you must work with averages. In the late middle game (50–100 players remaining), where super bounties have likely been collected from early eliminations, the remaining envelopes have a slightly lower average value — which argues for tighter calling ranges compared to the opening levels when the full envelope distribution is still intact.

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